Equipment mailbox in Room List

Hi,

I've setup a Room List mailbox and added equipment mailboxes as its members so that they could be booked using a calendar.

As of a week or a couple ago, all of the sudden the equipment mailboxes stopped showing up when Room List is selected. (they used to show up under "Scheduling Assistant")

Must have been an update to the exchange server.

I run Exchange 2010 SP3, Rollup 2

Any way to correct this behavior?

Thanks,